JP2004236390A - Small-sized brushless motor - Google Patents

Small-sized brushless motor Download PDF

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Publication number
JP2004236390A
JP2004236390A JP2003019597A JP2003019597A JP2004236390A JP 2004236390 A JP2004236390 A JP 2004236390A JP 2003019597 A JP2003019597 A JP 2003019597A JP 2003019597 A JP2003019597 A JP 2003019597A JP 2004236390 A JP2004236390 A JP 2004236390A
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JP
Japan
Prior art keywords
base
stator
bearing
bearing housing
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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JP2003019597A
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Japanese (ja)
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JP2004236390A5 (en
Inventor
Kazusane Kurihara
和実 栗原
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Tokyo Parts Ind Co Ltd
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Tokyo Parts Ind Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tokyo Parts Ind Co Ltd filed Critical Tokyo Parts Ind Co Ltd
Priority to JP2003019597A priority Critical patent/JP2004236390A/en
Priority to US10/766,579 priority patent/US7023116B2/en
Priority to CNB2004100036156A priority patent/CN100397753C/en
Publication of JP2004236390A publication Critical patent/JP2004236390A/en
Publication of JP2004236390A5 publication Critical patent/JP2004236390A5/ja
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/051—Axial thrust balancing
    • F04D29/0513—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/187—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to inner stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H02K5/1675—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at only one end of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/085—Structural association with bearings radially supporting the rotary shaft at only one end of the rotor

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Motor Or Generator Frames (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor in which the workability and the assembling work of parts are simplified and which has a thrust bearing member having excellent reliability without the deformation of a bearing and without the leakage of a lubricant. <P>SOLUTION: A burring work is performed at the substantially center of a stator base 10 by a press, and a cylindrical part 11 as the base of the bearing housing of this motor is formed integrally with the stator base 10. The sleeve bearing 20 of a radial bearing is press injected and fixed to the inside 11a of this cylindrical part 11. Further, a stator S, to which a stator core 40 wound with a coil 30 made of a lead wire is fixed, is formed at the outside 11b of the cylindrical part 11. Incidentally, the thrust bearing part 60 of a rotary shaft 50 is molded integrally with the stator base 10 by the resin integrally molding process of an outsert molding method in the opening 11c of the cylindrical part 11 of the stator base 10, and receives the opposite output side end part of the rotary shaft 50. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えばディスクメディアを利用した記録再生装置の小型ブラシレスモータに関するものである。
【０００２】
【従来の技術】
従来から小型ブラシレスモータの軸受部材を支持する軸受ハウジング構造において、鉄板等の鉄系金属材料やアルミニューム等の非鉄系金属材料の薄板からなるステータベースのほぼ中央をバーリング加工を施し、このステータベースと同一素材で軸受ハウジング部をステータベースと一体に形成しているものがある。
【０００３】
このような軸受ハウジングの構造においては、このモータの回転軸の反負荷側端部を支持し、尚且つ、この軸受の潤滑油を漏れないように保持する、このステータベース材とは別部材からなるスラスト受け部材でバーリング基部を有底状に閉塞しなければならない。
なお、このスラスト方向の受け部材の形状と固着方法に関する従来の技術については次のようなものが知られている。
１）前記受け部材は皿状に形成し、これをステータベースの軸受ハウジング部周辺に設けられた段部の平面部を介してステータコアとネジ止めする。（例えば、特許文献１参照）
２）前記受け部材はプレス加工や切削加工などによりカップ状の金属リング部材を形成し、これをステータベースのバーリング基部に圧入する。（例えば、特許文献２参照）
３）前記受け部材は円盤状に形成し、これを軸受下端部の凹所に嵌入しカシメる。（例えば、特許文献３参照）
４）前記受け部材は円盤状に形成し、これをステータベースのバーリング基部を閉塞するように前記開口部の近傍に溶接または接着する。（例えば、特許文献４参照）
【０００４】
【特許文献１】
特開平９−１０３０４３号公報
【特許文献２】
特開平８−２８９５２３号公報
【特許文献３】
特開平８−２７５４３９号公報
【特許文献４】
特開平８−２１４４８７号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、前述した従来技術のいずれにおいても後述するような問題点を抱えている。
すなわち、前述の、
１）においては、タッピング加工時やセルフタッピングを含むネジ止め作業時に金属屑が発生し、その金属屑が軸受内部に入り込む恐れがある。さらに、ネジ部の加工およびネジ止めの作業性が悪く、また、合わせ目より潤滑油の漏れる危険性がある。
２）においては、金属リング部材が抜けたり外れたりする危険性があり、また、スラスト方向の寸法ばらつきが発生し易くロータが軸受部と接触し回転不能になる危険性がある。
３）においては、軸受の端部に直接カシメるので、軸受の内径等が変形する危険性と、カシメ部のガタや外れの危険性と、潤滑油の漏れの危険性がある。
４）においては、溶接や接着の作業性が悪いことと、溶着部や接着部が剥離したりピンホールが生じて、潤滑油が漏れる危険性がある。
【０００６】
そこで、本発明は上記の問題点を解決し、部品の加工性やその部品の組立作業が効率よく行うことができ、また、落下・衝撃等が加えられても外れや抜けの生じない堅牢で剛性があり、さらに、軸受の変形や潤滑油の漏れがなく、長寿命で信頼性に優た回転軸のスラスト受け部材を備えた小型ブラシレスモータを提供しようというものである。
【０００７】
【課題を解決するための手段】
上記課題を解決するには、請求項１に記載の発明のように、金属板からなるステータベースにバーリング加工を施すことにより円筒部を一体に形成して軸受ハウジングと、この軸受ハウジングの内側に取り付けられたロータの回転軸を回転自在に支承する軸受と、前記軸受ハウジングの外側に固着されたステータコアと、前記ステータコアに臨ませた複数の磁極を有するマグネットと、このマグネットが固着され中心に軸が配されたロータヨークとからなる小型ブラシレスモータにおいて、前記軸受ハウジングのバーリング基部は、このステータベースに樹脂一体成形により有底状に閉塞され、前記樹脂で前記回転軸の受け部を形成することにより達成できる。
【０００８】
または、請求項２に記載の発明のように、金属板からなるステータベースにバーリング加工を施すことにより円筒部を一体に形成して軸受ハウジングと、この軸受ハウジングの内側に取り付けられたロータの回転軸を回転自在に支承する軸受と、前記軸受ハウジングの外側に固着されたステータコアと、前記ステータコアに臨ませた複数の磁極を有するマグネットと、このマグネットが固着され中心に軸が配されたロータヨークと、前記ステータベースの前記軸受ハウジング部側の外方に駆動および制御するための回路を実装した回路基板とからなる小型ブラシレスモータにおいて、前記軸受ハウジングのバーリング基部は、このステータベースに樹脂一体成形により有底状に閉塞され、前記樹脂で前記回転軸の受け部を形成することにより達成できる。
【０００９】
さらに、請求項３に記載の発明のように、前記ステータベースの前記円筒部の基部にこのステータベースと樹脂一体成形により形成された前記ステータコアの位置決め係止部を形成するか、または、請求項４に記載の発明のように、前記ステータベースの前記円筒部の基部にこのステータベースと樹脂一体成形により形成された前記ステータコアおよび回路基板の位置決め係止部を形成することにより、前記部品の加工性やその部品の組立作業性の問題を解決できる。
【００１０】
【発明の実施の形態】
次に、本発明の実施の形態を図面に従って説明する。
図１は、本発明の実施の形態を示すモータの断面図である。
図１において、鉄板からなるステータベース１０のほぼ中央にプレスにてバーリング加工が施され、このモータの軸受ハウジングＪの基礎部となる円筒部１１がステータベース１０に一体に形成されている。また、この円筒部１１の内側１１ａには、ラジアル軸受のスリーブ軸受２０が圧入固着されている。さらに、円筒部１１の外側１１ｂには、銅線からなるコイル３０を巻回したステータコア４０が固着されステータＳを形成している。なお、ステータベース１０の円筒部１１の開口部１１ｃには、回転軸５０のスラスト受け部６０がステータベース１０にアウトサート成形法の樹脂一体成形法により一体成形され、回転軸５０の反出力側端部を受けている。
【００１１】
また、円筒部１１の内側の軸受２０とスラスト受け部６０に支承された回転軸５０には、カップ状のロータヨーク７０が固着され、そのロータヨーク７０の内周面にはステータコア４０の磁極に対向し配置された複数極を有する駆動用のマグネット８０が固着されロータ部Ｒを構成している。
さらに、ステータベース１０の円筒部１１側の平面部１０ａにはプリント基板からなる回路基板９０が固着されている。
【００１２】
図２は、図１に説明したプレスにてバーリング加工された円筒部１１の斜視図である。図２において、ステータベース１０の円筒部１１の基部近傍に孔１２が少なくとも１箇所設けられている。また、ステータベース１０の平面部１０ａには、図１における回路基板９０の取付孔１３および記録再生装置（図示しない）のフレーム固定用の孔１４がそれぞれ少なくとも１箇所設けられている。なお、ステータベース１０の材質は、鉄板以外に鉄系金属板または黄銅やアルミニュウムからなる非鉄金属板でもよい。
【００１３】
図３は、図１における軸受ハウジングＪの構造を示した要部断面図である。
図３において、ステータベース１０の円筒部１１のバーリング基部１１ｃを有底状に閉塞するスラスト受け部６０がアウトサート成形で形成されている。
また、バーリングにより形成された円筒部１１の基部方に、ステータコア４０および回路基板９０の位置決め係止部としての段部６１が、孔１２を介してスラスト受け部６０と一体にアウトサート成形され形成されている。この段部６１は、ステータベース１０の面に接する大径部６２と図１に示すステータコア４０の取付孔の縁面を支持する中径部６３および大径部６２と中径部６３をつなげるテーパ部６４で形成され、さらに、中径部６３に隣接して、図１のステータコア４０の取付孔が嵌入される円筒部１１の外周を覆うような小径部６５で構成されている。
【００１４】
図４は、図１に示したブラシレスモータのステータＳの分解斜視図である。
前記のように、大径部６２には、回路基板９０の取付孔９１が嵌入されるが、図４に示すように、この嵌合の回路基板９０の位置決め係止部として大径部６２の外周面に凸部６６が少なくとも１箇所設けられ、また、この凸部６６に対峙して回路基板９０の孔９１に位置決めの凹部９２が設けられている。
【００１５】
また、小径部６５の外周には、ステータコア４０の取付孔４１が嵌入されるが、この小径部６５の外周面には、ステータコア４０の取付孔４１の内周の所定の位置に設けられた取付位置決めの凹部４２に対峙して凸部６７が少なくとも１箇所設けられている。
なお、前記したそれぞれの凸部を凹部に、また前記したそれぞれの凹部を凸部に変えて設けてもよい。
【００１６】
前述した本発明に係るバーリング加工により形成された軸受ハウジング部Ｊの円筒部１１は、段部がないストレートな円筒状とすることができるので、特に、この円筒部１１を含むステータベース１０のプレス加工においての絞りの工程は簡略化でき、それにより金型費やプレス作業費を安価に得ることができる。
さらに、本発明に係るスラスト受け部６０や段部６１を形成するアウトサート成形は、このモータベース１０の外形切り離し前のワークのストリップに連結した状態で行うことができるので、部品加工の作業性効率をさらに向上させることができる。また、このアウトサート成形工程は、容易にステータベース１０のプレス工程に組み込むことができさらに生産性の向上に寄与できる。
【００１７】
また、段部６１の樹脂成形は、スラスト受け部６０のアウトサート成形時にその成形樹脂をステータベース１０の樹脂通過孔となる孔１２を介して流れ込むことによりスラスト軸受部６０と一体に形成されることになる。これによりスラスト受け部６０と段部６１はステータベース１０の円筒部１１の基部周囲に強固に密着した状態で形成される。また、同時に孔１２においても成形樹脂が充満するので、孔１２をほぼ完全に閉塞することができ、軸受ハウジングＪの底部に軸受の潤滑油が溜まっても漏れることはない。なお、この構造における成形樹脂の流し込み方向、すなわち、成形金型のゲート位置は、スラスト受け部６０または段部６１のどちら側にしてもよい。
【００１８】
なお、成形樹脂通過孔の孔１２は、図２または図３においてはステータベース１０の平面部１０ａに設けられたものを示しているが、円筒部１１の円筒側面基部に樹脂通過孔を設けてもよい。その場合においても前述と同じように、アウトサート成形時にこの成型樹脂により基部円筒側面の樹脂通過孔を確実に閉塞することができる。
【００１９】
また、前述した本発明に係るスラスト受け部６０は、ポリフェニレンサルファイド（ＰＰＳ）樹脂やポリアセタール（ＰＯＭ）樹脂等の低摩擦摺動性、耐熱性、耐油性、耐候性、耐クリープ性、機械的強度、弾力性、剛性、寸法安定性等に優れた合成樹脂で形成されているので、軽量化や長寿命化が容易に得られる。
また、本発明に係るスラスト受け部６０は、従来技術における回転軸のアキシャル軸受としての当板の機能を兼用させることができるので、本発明品においてはその当板を省略することができる。
【００２０】
また、本発明に係るモータと、従来技術の金属からなる軸受ハウジングの底部にポリエーテルエーテルケトン（ＰＥＥＫ）製の当板（アキシャル軸受）を用いた軸受機構を有するモータとの周囲温度４０゜Ｃにおける３０００時間連続耐久試験後の軸方向の変位量を比較すると、前者は０．０５ｍｍで後者は０．１７ｍｍであった。このことから、本発明に係るモータは、従来技術からなるモータより明らかに優れた耐久性を呈することがわかる。なお、前記耐久試験に用いた負荷は、３ｇ−ｍｍの偏心量を有する直径１２ｃｍディスクとし、耐久試験の回転数は５０００ｒｐｍであった。
【００２１】
さらに、スラスト受け部６０の回転軸５０の端部を受ける形状は、金型により任意に形成することができる。例えば、図１に示す如く凹状にしてもよい。この形状においては、回転軸６０のスラスト受け部６０側端部に空間を確保できるのでこの空間を利用して回転軸５０の抜け止め部材（図示しない）を配置することができる。
【００２２】
また、本発明に係る軸受ハウジング部１１の基部を構成する段部６１は樹脂で形成されているので、コイル３０を軸受ハウジング部１１の段部６１に強く密着させてもコイル３０の絶縁不良の問題を生じることがないので、よりモータの薄型化がはかれる。
【００２３】
なお、ステータコア４０は、金属製の円筒部１１の外周にアウトサートされた樹脂スリーブ部、すなわち、段部６１の小径部６５を介して軸受ハウジング部Ｊに嵌入されることになる。このような構造においては、円筒部１１やスリーブ軸受２０を変形することなく、またステータコア４０をガタ無く強固に軸受ハウジング部Ｊの所定の位置に嵌入することができる。また、ステータコア４０の軸受ハウジング部Ｊからの抜け止め方法としては樹脂超音波溶着法が可能となる。
さらに、円筒部１１の外周とステータコア４０の内径の間に樹脂の小径部６５が介添えするのでコギングや回転の振動が吸収され、その結果モータの回転特性は安定化される。
【００２４】
なお、前述のように、樹脂から成る小径部６５を設けたことにより軸受ハウジングの外径寸法がばらついてもこの樹脂部がその誤差分を吸収するので、ステータコア４０の嵌入部、すなわち小径部６５の外径寸法は常に一定に確保することができ、ステータコア４０と軸受ハウジング部１１の嵌入をガタ無くあるいはきつくなく行うことができる。
また、バーリング加工による円筒部１１の高さ寸法がばらつく場合は、成形品の基準を円筒部１１の内径とし、図５に示すようにバーリング部すなわち円筒部１１の内径を金型固定側Ｋ１のガイドピンＧに挿入し、ステータベース１０を金型固定側Ｋ１にセットし、金型可動側Ｋ２を型締めし射出成形を行う。なお、ステータベース１０を金型固定側にセットした状態で、円筒部１１の先端部１１ｃと金型固定側Ｋ１に間隙を持たせ、成形により段部６１の小径部６５の端面に樹脂部６５ａを形成するような構造にしてやれば、円筒部１１の高さ寸法がばらついても、この誤差分を樹脂部６５ａで吸収でき、その結果、高さ寸法が安定した、尚且つ、成形バリのない軸受ハウジングＪを得ることができる。この成形の変形例として、小径部６５を廃止または短く形成しようとする構造の場合は、円筒部１１の外径を基準として軸受ハウジング部を成形し、その後、軸受ハウジング部の内径をサイジングする方法もとることができる。
【００２５】
図６は、図１の変形を示したものである。これは、図１の回路基板９０を省いたものである。この実施においては、ステータベース１１０自体を回路がプリントされた鉄基板としてもよい。また、このステータベース１１０にコイルの給電端子台を一体に（図示しないが）アウトサートしてもよい。
【００２６】
【発明の効果】
以上説明したように、ステータベースにバーリング加工を施し、円筒部を一体に形成して軸受ハウジングとし、この軸受ハウジングのバーリング基部を樹脂一体成形（アウトサート成型）により有底状に閉塞された前記樹脂で前記回転軸の受け部を形成することにより次のような効果を得ることができる。
１．スラスト受け部は、アウトサート成型によりモータベースに強固に取り付けられるので、剛性が有り、尚且つ、振動、落下等の衝撃においても外れ・ガタ・抜け、亀裂等が生じない軸受機構を有するモータが得られる。
２．スラスト受け部は、アウトサート成型で形成されるので、軸受ハウジングの底部の閉塞機能の信頼性が向上し、潤滑油等の漏れが生じない長寿命のモータが得られる。
３．軸受はスラスト受け部を形成後、取り付けられるので、従来技術におけるスラスト受け部材の取付による軸受内径等の変形が発生しない。
４．スラスト受け部はアウトサートにより形成されるので、効率よく部品の加工や組立作業を行うことができ、また、アウトサートされたスラスト受け部に回転軸の端部を受けるスラスト板の機能を兼用させることができるので部品の削減化がはかれる。
【００２７】
さらに、前記軸受ハウジングを構成する前記円筒部の基部に、前記ステータベースと樹脂一体成形により、前記ステータコアや回路基板の位置決め部、ステータコアの嵌入部などを構成する前記段部を設けることにより確実に巻線のショートを防止でき、さらに、前記回路基板やステータコアの位置決めを所定の位置に効率よく行うことができる。
【図面の簡単な説明】
【図１】本発明の実施の形態を示す小型ブラシレスモータの断面正面図である。
【図２】図１におけるバーリング加工の円筒部を示す斜視図である。
【図３】図１におけるアウトサート成形された軸受ハウジング部を示す断面図である。
【図４】図１に示したブラシレスモータのステータ部の分解斜視図である。
【図５】図１における軸受ハウジングの成形を示す要部断面図である。
【図６】図１の変形例を示すモータの断面正面図である。
【符号の説明】
１０ ステータベース
１１ 円筒部
２０ スリーブ軸受
３０ コイル
４０ ステータコア
５０ 回転軸
６０ スラスト受け部
７０ ロータヨーク
８０ マグネット
９０ 回路基板
Ｊ 軸受ハウジング
Ｓ ステータ
Ｒ ロータ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a small brushless motor of a recording / reproducing apparatus using a disk medium, for example.
[0002]
[Prior art]
Conventionally, in a bearing housing structure for supporting a bearing member of a small brushless motor, a substantially center of a stator base made of a thin plate of an iron-based metal material such as an iron plate or a non-ferrous metal material such as aluminum is subjected to a burring process. And the bearing housing portion is formed integrally with the stator base using the same material as the above.
[0003]
In such a structure of the bearing housing, a member separate from the stator base material is used to support the end of the rotating shaft of the motor on the non-load side and to keep the lubricant of the bearing from leaking. The burring base must be closed by a thrust receiving member.
The following is known as a conventional technique relating to the shape and fixing method of the receiving member in the thrust direction.
1) The receiving member is formed in a dish shape and is screwed to the stator core via a flat portion of a step provided around the bearing housing of the stator base. (For example, see Patent Document 1)
2) The receiving member forms a cup-shaped metal ring member by pressing or cutting, and is press-fitted into a burring base of the stator base. (For example, see Patent Document 2)
3) The receiving member is formed in a disk shape, which is fitted into a recess at the lower end of the bearing and caulked. (For example, see Patent Document 3)
4) The receiving member is formed in a disk shape and is welded or bonded to the vicinity of the opening so as to close the burring base of the stator base. (For example, see Patent Document 4)
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-103443 [Patent Document 2]
JP-A-8-289523 [Patent Document 3]
Japanese Patent Application Laid-Open No. 8-275439 [Patent Document 4]
JP-A-8-214487
[Problems to be solved by the invention]
However, any of the above-mentioned prior arts has the following problems.
That is, as described above,
In 1), metal chips are generated at the time of tapping or screwing work including self-tapping, and the metal chips may enter the inside of the bearing. Further, the workability of processing and screwing the screw portion is poor, and there is a risk that the lubricating oil leaks from the joint.
In the case of 2), there is a risk that the metal ring member comes off or comes off, and there is a risk that dimensional variations in the thrust direction are likely to occur, and the rotor comes into contact with the bearing portion and cannot rotate.
In 3), since the end of the bearing is directly caulked, there is a risk that the inner diameter of the bearing is deformed, a risk that the caulked portion is loose or detached, and a risk that the lubricating oil leaks.
In the case of 4), the workability of welding and bonding is poor, and there is a danger that lubricating oil leaks due to peeling of a welded portion or a bonded portion or generation of a pinhole.
[0006]
Therefore, the present invention solves the above-mentioned problems, the workability of the parts and the assembling work of the parts can be performed efficiently, and the robustness that does not cause detachment or detachment even when a drop or impact is applied. An object of the present invention is to provide a small brushless motor having a thrust receiving member of a rotating shaft which is rigid, has no deformation of a bearing, leaks lubricating oil, and has a long life and excellent reliability.
[0007]
[Means for Solving the Problems]
In order to solve the above problem, as in the first aspect of the present invention, a cylindrical portion is integrally formed by performing burring processing on a stator base made of a metal plate to form a cylindrical body integrally with the bearing housing. A bearing that rotatably supports a rotating shaft of the attached rotor; a stator core fixed to the outside of the bearing housing; a magnet having a plurality of magnetic poles facing the stator core; In a small brushless motor including a rotor yoke provided with a burring base, the burring base of the bearing housing is closed to a bottomed shape by resin integral molding with the stator base, and the receiving portion of the rotary shaft is formed by the resin. Can be achieved.
[0008]
Alternatively, a cylindrical portion is integrally formed by subjecting a stator base made of a metal plate to burring processing as in the invention according to claim 2 to rotate a bearing housing and a rotor mounted inside the bearing housing. A bearing rotatably supporting a shaft, a stator core fixed to the outside of the bearing housing, a magnet having a plurality of magnetic poles facing the stator core, and a rotor yoke on which the magnet is fixed and the shaft is disposed at the center. A small brushless motor comprising a circuit board mounted with a circuit for driving and controlling the stator base outside the bearing housing portion side of the stator base, wherein the burring base of the bearing housing is formed integrally with the stator base by resin molding. By being closed with a bottom and forming the receiving portion of the rotating shaft with the resin, It can be formed.
[0009]
Further, as in the invention as set forth in claim 3, a positioning and locking portion of the stator core formed by resin integral molding with the stator base is formed at a base of the cylindrical portion of the stator base, or As in the invention described in Item 4, the positioning of the stator core and the circuit board formed by resin integral molding with the stator base is formed at the base of the cylindrical portion of the stator base, thereby processing the components. And the problem of assembly work of the parts can be solved.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a motor showing an embodiment of the present invention.
In FIG. 1, a burring process is performed by press at substantially the center of a stator base 10 made of an iron plate, and a cylindrical portion 11 serving as a base portion of a bearing housing J of this motor is formed integrally with the stator base 10. A sleeve bearing 20 of a radial bearing is press-fitted and fixed to an inner side 11a of the cylindrical portion 11. Further, a stator core 40 around which a coil 30 made of a copper wire is wound is fixed to an outer side 11b of the cylindrical portion 11 to form a stator S. The thrust receiving portion 60 of the rotating shaft 50 is integrally formed with the stator base 10 in the opening 11c of the cylindrical portion 11 of the stator base 10 by an outsert molding method. Has received the end.
[0011]
Further, a cup-shaped rotor yoke 70 is fixed to the rotating shaft 50 supported by the bearing 20 and the thrust receiving portion 60 inside the cylindrical portion 11, and the inner peripheral surface of the rotor yoke 70 faces the magnetic pole of the stator core 40. A driving magnet 80 having a plurality of poles arranged is fixed to form a rotor portion R.
Further, a circuit board 90 made of a printed board is fixed to the flat portion 10a on the cylindrical portion 11 side of the stator base 10.
[0012]
FIG. 2 is a perspective view of the cylindrical portion 11 that has been burred by the press described in FIG. In FIG. 2, at least one hole 12 is provided near the base of the cylindrical portion 11 of the stator base 10. Further, at least one mounting hole 13 of the circuit board 90 in FIG. 1 and a hole 14 for fixing a frame of a recording / reproducing device (not shown) are provided in the flat portion 10 a of the stator base 10. The material of the stator base 10 may be an iron-based metal plate or a non-ferrous metal plate made of brass or aluminum other than the iron plate.
[0013]
FIG. 3 is a sectional view of a main part showing the structure of the bearing housing J in FIG.
In FIG. 3, a thrust receiving portion 60 for closing the burring base 11c of the cylindrical portion 11 of the stator base 10 with a bottom is formed by outsert molding.
In addition, a step portion 61 as a positioning and locking portion of the stator core 40 and the circuit board 90 is formed by outsert molding integrally with the thrust receiving portion 60 through the hole 12 on the base portion of the cylindrical portion 11 formed by burring. Have been. The stepped portion 61 has a large-diameter portion 62 in contact with the surface of the stator base 10, a medium-diameter portion 63 supporting the edge surface of the mounting hole of the stator core 40 shown in FIG. 1, and a taper connecting the large-diameter portion 62 and the medium-diameter portion 63. A small-diameter portion 65 is formed adjacent to the middle-diameter portion 63 and covers the outer periphery of the cylindrical portion 11 into which the mounting hole of the stator core 40 in FIG. 1 is fitted.
[0014]
FIG. 4 is an exploded perspective view of the stator S of the brushless motor shown in FIG.
As described above, the mounting hole 91 of the circuit board 90 is fitted into the large-diameter portion 62, but as shown in FIG. At least one convex portion 66 is provided on the outer peripheral surface, and a concave portion 92 for positioning is provided in the hole 91 of the circuit board 90 so as to face the convex portion 66.
[0015]
The mounting hole 41 of the stator core 40 is fitted into the outer periphery of the small diameter portion 65, and the mounting hole provided at a predetermined position on the inner periphery of the mounting hole 41 of the stator core 40 is fitted on the outer peripheral surface of the small diameter portion 65. At least one convex portion 67 is provided to face the positioning concave portion 42.
Note that each of the above-described convex portions may be provided as a concave portion, and each of the above-described concave portions may be provided as a convex portion.
[0016]
Since the cylindrical portion 11 of the bearing housing portion J formed by the burring process according to the present invention described above can be formed into a straight cylindrical shape with no step, in particular, the pressing of the stator base 10 including the cylindrical portion 11 is performed. The drawing process in the working can be simplified, so that the mold cost and the press work cost can be obtained at low cost.
Further, the outsert molding for forming the thrust receiving portion 60 and the step portion 61 according to the present invention can be performed in a state where the outer shape of the motor base 10 is connected to the strip of the work before the outer shape is cut off, so that the workability of component processing is improved. Efficiency can be further improved. In addition, this outsert forming step can be easily incorporated into the pressing step of the stator base 10 and can contribute to improvement in productivity.
[0017]
The resin molding of the step portion 61 is formed integrally with the thrust bearing portion 60 by flowing the molding resin through the hole 12 serving as the resin passage hole of the stator base 10 at the time of outsert molding of the thrust receiving portion 60. Will be. Thus, the thrust receiving portion 60 and the step portion 61 are formed in a state in which the thrust receiving portion 60 and the step portion 61 are firmly adhered to the periphery of the base of the cylindrical portion 11 of the stator base 10. At the same time, the hole 12 is also filled with the molding resin, so that the hole 12 can be almost completely closed, and even if lubricating oil for the bearing accumulates at the bottom of the bearing housing J, there is no leakage. In this structure, the direction in which the molding resin is poured, that is, the gate position of the molding die may be on either side of the thrust receiving portion 60 or the step portion 61.
[0018]
The hole 12 of the molded resin passage hole is shown in FIG. 2 or FIG. 3 as being provided on the flat portion 10 a of the stator base 10, but the resin passage hole is provided at the base of the cylindrical side surface of the cylindrical portion 11. Is also good. In this case, as in the case described above, the resin passage hole in the side surface of the base cylinder can be reliably closed by the molding resin during the outsert molding.
[0019]
Further, the above-described thrust receiving portion 60 according to the present invention is made of a low friction sliding property such as polyphenylene sulfide (PPS) resin or polyacetal (POM) resin, heat resistance, oil resistance, weather resistance, creep resistance, and mechanical strength. Since it is formed of a synthetic resin having excellent elasticity, rigidity, dimensional stability, and the like, it is easy to achieve weight reduction and long life.
In addition, the thrust receiving portion 60 according to the present invention can also function as an abutment plate as an axial bearing of a rotating shaft in the prior art, so that the abutment plate can be omitted in the product of the present invention.
[0020]
An ambient temperature of 40 ° C. between the motor according to the present invention and a motor having a bearing mechanism using a polyether ether ketone (PEEK) plate (axial bearing) at the bottom of a conventional bearing housing made of metal. When the amount of displacement in the axial direction after the 3000-hour continuous durability test was compared, the former was 0.05 mm and the latter was 0.17 mm. This shows that the motor according to the present invention exhibits significantly better durability than the motor according to the prior art. The load used in the durability test was a 12 cm diameter disk having an eccentricity of 3 g-mm, and the rotation speed in the durability test was 5000 rpm.
[0021]
Further, the shape of the thrust receiving portion 60 that receives the end of the rotating shaft 50 can be arbitrarily formed by a mold. For example, the shape may be concave as shown in FIG. In this shape, since a space can be secured at the end of the rotating shaft 60 on the thrust receiving portion 60 side, a retaining member (not shown) of the rotating shaft 50 can be arranged using this space.
[0022]
Further, since the step 61 constituting the base of the bearing housing portion 11 according to the present invention is formed of resin, even if the coil 30 is brought into close contact with the step portion 61 of the bearing housing portion 11, insulation failure of the coil 30 may occur. Since no problem occurs, the motor can be made thinner.
[0023]
In addition, the stator core 40 is fitted into the bearing housing J through the resin sleeve portion that is outsert on the outer periphery of the metal cylindrical portion 11, that is, the small diameter portion 65 of the step portion 61. In such a structure, the stator core 40 can be firmly fitted into a predetermined position of the bearing housing J without deformation of the cylindrical portion 11 and the sleeve bearing 20 and without play. As a method for preventing the stator core 40 from coming off from the bearing housing J, a resin ultrasonic welding method can be used.
Furthermore, since the small diameter portion 65 of the resin is interposed between the outer periphery of the cylindrical portion 11 and the inner diameter of the stator core 40, cogging and rotational vibration are absorbed, and as a result, the rotational characteristics of the motor are stabilized.
[0024]
As described above, even if the outer diameter of the bearing housing varies due to the provision of the small-diameter portion 65 made of resin, the resin portion absorbs the error, so the fitting portion of the stator core 40, that is, the small-diameter portion 65 Can always be kept constant, and the fitting between the stator core 40 and the bearing housing portion 11 can be performed without play or tightly.
When the height of the cylindrical portion 11 varies due to the burring process, the reference of the molded product is the inner diameter of the cylindrical portion 11, and as shown in FIG. It is inserted into the guide pin G, the stator base 10 is set on the mold fixed side K1, the mold movable side K2 is clamped, and injection molding is performed. In the state where the stator base 10 is set on the mold fixing side, a gap is provided between the distal end portion 11c of the cylindrical portion 11 and the mold fixing side K1, and the resin portion 65a is formed on the end face of the small diameter portion 65 of the step portion 61 by molding. Is formed, the error can be absorbed by the resin portion 65a even if the height of the cylindrical portion 11 varies, so that the height is stable and there is no molding burr. A bearing housing J can be obtained. As a modified example of this molding, in the case of a structure in which the small diameter portion 65 is to be eliminated or shortened, a method of forming the bearing housing portion based on the outer diameter of the cylindrical portion 11 and then sizing the inner diameter of the bearing housing portion is adopted. Can be taken.
[0025]
FIG. 6 shows a modification of FIG. This omits the circuit board 90 of FIG. In this embodiment, the stator base 110 itself may be an iron substrate on which a circuit is printed. In addition, a power supply terminal block for the coil may be integrated with the stator base 110 (not shown).
[0026]
【The invention's effect】
As described above, the burring process is performed on the stator base, the cylindrical portion is integrally formed to form a bearing housing, and the burring base of the bearing housing is closed with a bottom with a resin integral molding (outsert molding). The following effects can be obtained by forming the receiving portion of the rotating shaft with resin.
1. Since the thrust receiving part is firmly attached to the motor base by outsert molding, there is a motor that has a rigidity, and has a bearing mechanism that does not come off, rattle, drop out, crack, etc. even under shocks such as vibration and dropping. can get.
2. Since the thrust receiving portion is formed by outsert molding, the reliability of the closing function of the bottom portion of the bearing housing is improved, and a long-life motor free of leakage of lubricating oil and the like can be obtained.
3. Since the bearing is attached after forming the thrust receiving portion, deformation of the bearing inner diameter and the like due to attachment of the thrust receiving member in the prior art does not occur.
4. Since the thrust receiving portion is formed by outsert, parts can be processed and assembled efficiently, and the outsert thrust receiving portion also serves as a thrust plate for receiving the end of the rotating shaft. Parts can be reduced.
[0027]
Further, by providing the stator base and the resin base integrally with the stator base to form the stator core and the circuit board positioning portion, the stator core fitting portion, and the like, the base portion of the cylindrical portion constituting the bearing housing is securely provided. Short-circuiting of the winding can be prevented, and the circuit board and the stator core can be efficiently positioned at predetermined positions.
[Brief description of the drawings]
FIG. 1 is a sectional front view of a small brushless motor according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a burring cylindrical portion in FIG. 1;
3 is a sectional view showing an outsert molded bearing housing section in FIG. 1;
FIG. 4 is an exploded perspective view of a stator portion of the brushless motor shown in FIG.
FIG. 5 is a cross-sectional view of a main part showing molding of the bearing housing in FIG.
FIG. 6 is a sectional front view of a motor showing a modification of FIG. 1;
[Explanation of symbols]
Reference Signs List 10 Stator base 11 Cylindrical part 20 Sleeve bearing 30 Coil 40 Stator core 50 Rotating shaft 60 Thrust receiving part 70 Rotor yoke 80 Magnet 90 Circuit board J Bearing housing S Stator R Rotor

Claims (4)

金属板からなるステータベースにバーリング加工を施すことにより円筒部を一体に形成して軸受ハウジングと、この軸受ハウジングの内側に取り付けられたロータの回転軸を回転自在に支承する軸受と、前記軸受ハウジングの外側に固着されたステータコアと、前記ステータコアに臨ませた複数の磁極を有するマグネットと、このマグネットが固着され中心に軸が配されたロータヨークとからなる小型ブラシレスモータにおいて、
前記軸受ハウジングのバーリング基部は、このステータベースに樹脂一体成形により有底状に閉塞され、前記樹脂で前記回転軸の受け部を形成したことを特徴とした小型ブラシレスモータ。A cylindrical housing is integrally formed by subjecting a stator base made of a metal plate to a burring process, a bearing for rotatably supporting a rotating shaft of a rotor mounted inside the bearing housing, and the bearing housing. In a small brushless motor including a stator core fixed to the outside of the rotor, a magnet having a plurality of magnetic poles facing the stator core, and a rotor yoke on which the magnet is fixed and a shaft is arranged at the center,
A small brushless motor characterized in that a burring base of the bearing housing is closed to a bottom with a resin integral molding with the stator base, and a receiving portion of the rotating shaft is formed of the resin. 金属板からなるステータベースにバーリング加工を施すことにより円筒部を一体に形成して軸受ハウジングと、この軸受ハウジングの内側に取り付けられたロータの回転軸を回転自在に支承する軸受と、前記軸受ハウジングの外側に固着されたステータコアと、前記ステータコアに臨ませた複数の磁極を有するマグネットと、このマグネットが固着され中心に軸が配されたロータヨークと、前記ステータベースの前記軸受ハウジング部側の外方に駆動および制御するための回路を実装した回路基板とからなる小型ブラシレスモータにおいて、
前記軸受ハウジングのバーリング基部は、このステータベースに樹脂一体成形により有底状に閉塞され、前記樹脂で前記回転軸の受け部を形成したことを特徴とした小型ブラシレスモータ。A cylindrical housing is integrally formed by subjecting a stator base made of a metal plate to a burring process, a bearing for rotatably supporting a rotating shaft of a rotor mounted inside the bearing housing, and the bearing housing. A magnet having a plurality of magnetic poles facing the stator core, a rotor yoke to which the magnet is fixed and having a shaft disposed at the center thereof, and a stator yoke having an outer periphery on the bearing housing portion side of the stator base. In a small brushless motor consisting of a circuit board on which a circuit for driving and controlling is mounted,
A small brushless motor characterized in that a burring base of the bearing housing is closed to a bottom with a resin integral molding with the stator base, and a receiving portion of the rotating shaft is formed of the resin. 前記ステータベースの前記円筒部の基部にこのステータベースと樹脂一体成形により形成された前記ステータコアの位置決め係止部を形成した請求項１に記載の小型ブラシレスモータ。2. The small brushless motor according to claim 1, wherein a positioning locking portion of the stator core formed by integrally molding the stator base and the resin is formed at a base of the cylindrical portion of the stator base. 3. 前記ステータベースの前記円筒部の基部にこのステータベースと樹脂一体成形により形成された前記ステータコアおよび回路基板の位置決め係止部を形成した請求項２に記載の小型ブラシレスモータ。3. The small brushless motor according to claim 2, wherein a positioning locking portion for positioning the stator core and the circuit board formed by integrally molding the stator base and the resin is formed at a base of the cylindrical portion of the stator base. 4.
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